Prepared with UFL flower delivery. A potted crocus is a popular spring gift in Ukraine for Women’s Day on 8 March. It flowers for only 1–3 weeks, but you do not have to throw the corm away: with the right care it will bloom again in the garden or on a windowsill. Here is how to care for a flowering crocus, what to do afterwards and how to grow crocuses yourself.
The crocus is a small corm-forming plant of the iris family, with about 90 species. Most bloom in early spring right after the snow melts, but some flower in autumn. Colours include purple, lilac, white, yellow and striped.
Do not confuse autumn crocuses with meadow saffron (Colchicum): it looks similar but is highly poisonous. Colchicum has six stamens, a crocus has three. Wild crocuses are protected in Ukraine, so never dig them up.
Caring for a flowering crocus in a pot
Keep it cool. Crocuses like +10…+15 °C. Keep the pot on a bright windowsill away from radiators by day and on a glazed balcony (+2…+5 °C) at night. It will then flower for 2–3 weeks; in a warm room the flowers drop within days.
Light: bright, but no direct midday sun.
Watering: moderate, when the top of the soil is dry. Water from the saucer, as water on the corm causes rot, and pour off the excess after 20 minutes.
When: spring-flowering types in September–October, autumn-flowering ones in July–August.
Where: sun or light shade and light, free-draining soil. They look best in drifts in a lawn, rock garden or under trees.
Depth: 8–10 cm (three times the corm height), 5–7 cm apart.
Propagation: after 3–4 years offsets form around the mother corm. Lift the clumps once the leaves die back, divide them and replant in autumn.
Mice: plant in mesh bulb baskets.
Forcing crocuses indoors for 8 March
To make a potted crocus bloom on a set date, it needs an artificial winter.
Approximate dates: count back from the day you want flowers.
Choose large, healthy corms of large-flowered varieties (5+ cm around).
In late September or early October plant them close together in a shallow pot of light soil, tips level with the surface.
Water and keep in a dark, cool place (+5…+9 °C) — a cellar, the vegetable drawer of a fridge or a frost-free unheated balcony — for 14–15 weeks. Keep the soil barely moist.
When shoots are 3–5 cm tall, about 3 weeks before the target date, move the pot into light at +15 °C.
Once buds appear, keep the crocus cool so it flowers longer.
Saffron is the dried stigmas of just one species, the autumn-flowering saffron crocus. Each flower yields three thin red threads, so a kilogram of spice takes around 150,000 hand-picked flowers — hence the price. Saffron turns food golden and has a honeyed, slightly bitter aroma: a few threads are enough for pilaf, risotto or baking.
Why a potted crocus will not flower or wilts quickly
Buds dried up without opening — the room is too warm or dry. Move the pot somewhere cool, at least overnight.
Only leaves, no flowers — the corms were not chilled long enough or were too small. You cannot rescue this season’s bloom, but the corms can recover in the garden.
Leaves stretched and flopped — not enough light. A crocus needs the brightest windowsill, not a table in the middle of the room.
The base is soft and smells — the corms are rotting from overwatering. Water moderately and empty the saucer.
Flowers closed in the daytime — normal on dull days: crocuses open in light and warmth and close in darkness.
FAQ
Why did my potted crocus finish so fast?
Usually because it was too warm: above +22 °C the flowers open and drop within days. Keep the plant cool.
Can I plant a gifted crocus in the garden in spring?
Yes, once the ground has thawed. Plant it with its root ball, keep the leaves and look after it until they die back naturally.
Are crocuses poisonous?
Spring crocuses are considered low in toxicity, but the corms should not be eaten. The look-alike meadow saffron is the dangerous one.
Graduated from Taras Shevchenko National University of Kyiv, Institute of Biology and Medicine (2001). BSc in Biology, MSc in Horticulture. Writes about plants, works at a garden centre selecting and repotting plants, and contributes to plant reference guides.
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